FreeBSD-5.3/usr.sbin/atm/scspd/scsp_socket.c
/*
*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*
* @(#) $FreeBSD: src/usr.sbin/atm/scspd/scsp_socket.c,v 1.4 2002/05/16 23:57:37 arr Exp $
*
*/
/*
* Server Cache Synchronization Protocol (SCSP) Support
* ----------------------------------------------------
*
* SCSP socket management routines
*
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netatm/port.h>
#include <netatm/queue.h>
#include <netatm/atm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include <libatm.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "scsp_msg.h"
#include "scsp_if.h"
#include "scsp_var.h"
#ifndef lint
__RCSID("@(#) $FreeBSD: src/usr.sbin/atm/scspd/scsp_socket.c,v 1.4 2002/05/16 23:57:37 arr Exp $");
#endif
/*
* Local variables
*/
static struct t_atm_llc llc_scsp = {
T_ATM_LLC_SHARING,
8,
{0xaa, 0xaa, 0x03, 0x00, 0x00, 0x5e, 0x00, 0x05}
};
static struct t_atm_aal5 aal5 = {
0, /* forward_max_SDU_size */
0, /* backward_max_SDU_size */
0 /* SSCS_type */
};
static struct t_atm_traffic traffic = {
{ /* forward */
T_ATM_ABSENT, /* PCR_high_priority */
0, /* PCR_all_traffic */
T_ATM_ABSENT, /* SCR_high_priority */
T_ATM_ABSENT, /* SCR_all_traffic */
T_ATM_ABSENT, /* MBS_high_priority */
T_ATM_ABSENT, /* MBS_all_traffic */
T_NO /* tagging */
},
{ /* backward */
T_ATM_ABSENT, /* PCR_high_priority */
0, /* PCR_all_traffic */
T_ATM_ABSENT, /* SCR_high_priority */
T_ATM_ABSENT, /* SCR_all_traffic */
T_ATM_ABSENT, /* MBS_high_priority */
T_ATM_ABSENT, /* MBS_all_traffic */
T_NO /* tagging */
},
T_YES /* best_effort */
};
static struct t_atm_bearer bearer = {
T_ATM_CLASS_X, /* bearer_class */
T_ATM_NULL, /* traffic_type */
T_ATM_NULL, /* timing_requirements */
T_NO, /* clipping_susceptibility */
T_ATM_1_TO_1 /* connection_configuration */
};
static struct t_atm_qos qos = {
T_ATM_NETWORK_CODING, /* coding_standard */
{ /* forward */
T_ATM_QOS_CLASS_0 /* qos_class */
},
{ /* backward */
T_ATM_QOS_CLASS_0 /* qos_class */
}
};
static struct t_atm_app_name appname = {
"SCSP"
};
/*
* Find a DCS, given its socket
*
* Arguments:
* sd socket descriptor
*
* Returns:
* 0 not found
* address of DCS block corresponding to socket
*
*/
Scsp_dcs *
scsp_find_dcs(sd)
int sd;
{
Scsp_server *ssp;
Scsp_dcs *dcsp = NULL;
/*
* Loop through the list of servers
*/
for (ssp = scsp_server_head; ssp; ssp = ssp->ss_next) {
/*
* Check all the DCSs chained from each server
*/
for (dcsp = ssp->ss_dcs; dcsp; dcsp = dcsp->sd_next) {
if (dcsp->sd_sock == sd)
break;
}
}
return(dcsp);
}
/*
* Find a server, given its socket
*
* Arguments:
* sd socket descriptor
*
* Returns:
* 0 not found
* address of server block corresponding to socket
*
*/
Scsp_server *
scsp_find_server(sd)
int sd;
{
Scsp_server *ssp;
/*
* Loop through the list of servers
*/
for (ssp = scsp_server_head; ssp; ssp = ssp->ss_next) {
if (ssp->ss_sock == sd)
break;
}
return(ssp);
}
/*
* Connect to a directly connected server
*
* Arguments:
* dcsp pointer to DCS block for server
*
* Returns:
* 0 success (dcsp->sd_sock is set)
* else errno indicating reason for failure
*
*/
int
scsp_dcs_connect(dcsp)
Scsp_dcs *dcsp;
{
int rc, sd;
struct sockaddr_atm DCS_addr;
/*
* If the DCS already has an open connection, just return
*/
if (dcsp->sd_sock != -1) {
return(0);
}
/*
* Open an ATM socket
*/
sd = socket(PF_ATM, SOCK_SEQPACKET, ATM_PROTO_AAL5);
if (sd == -1) {
return(ESOCKTNOSUPPORT);
}
if (sd > scsp_max_socket) {
scsp_max_socket = sd;
}
/*
* Set up connection parameters for SCSP connection
*/
bzero(&DCS_addr, sizeof(DCS_addr));
#if (defined(BSD) && (BSD >= 199103))
DCS_addr.satm_len = sizeof(DCS_addr);
#endif
DCS_addr.satm_family = AF_ATM;
DCS_addr.satm_addr.t_atm_sap_addr.SVE_tag_addr =
T_ATM_PRESENT;
DCS_addr.satm_addr.t_atm_sap_addr.SVE_tag_selector =
T_ATM_PRESENT;
DCS_addr.satm_addr.t_atm_sap_addr.address_format =
dcsp->sd_addr.address_format;
DCS_addr.satm_addr.t_atm_sap_addr.address_length =
dcsp->sd_addr.address_length;
bcopy(dcsp->sd_addr.address,
DCS_addr.satm_addr.t_atm_sap_addr.address,
dcsp->sd_addr.address_length);
DCS_addr.satm_addr.t_atm_sap_layer2.SVE_tag =
T_ATM_PRESENT;
DCS_addr.satm_addr.t_atm_sap_layer2.ID_type =
T_ATM_SIMPLE_ID;
DCS_addr.satm_addr.t_atm_sap_layer2.ID.simple_ID =
T_ATM_BLLI2_I8802;
DCS_addr.satm_addr.t_atm_sap_layer3.SVE_tag =
T_ATM_ABSENT;
DCS_addr.satm_addr.t_atm_sap_appl.SVE_tag =
T_ATM_ABSENT;
/*
* Bind the socket to our address
*/
if (bind(sd, (struct sockaddr *)&DCS_addr,
sizeof(DCS_addr))) {
rc = errno;
goto connect_fail;
}
/*
* Set non-blocking operation
*/
#ifdef sun
rc = fcntl(sd, F_SETFL, FNBIO + FNDELAY);
#else
rc = fcntl(sd, F_SETFL, O_NONBLOCK);
#endif
if (rc == -1) {
scsp_log(LOG_ERR, "scsp_dcs_connect: fcntl failed");
rc = errno;
goto connect_fail;
}
/*
* Set AAL 5 options
*/
aal5.forward_max_SDU_size = dcsp->sd_server->ss_mtu;
aal5.backward_max_SDU_size = dcsp->sd_server->ss_mtu;
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_AAL5, (caddr_t)&aal5,
sizeof(aal5)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Set traffic options
*/
switch(dcsp->sd_server->ss_media) {
case MEDIA_TAXI_100:
traffic.forward.PCR_all_traffic = ATM_PCR_TAXI100;
traffic.backward.PCR_all_traffic = ATM_PCR_TAXI100;
break;
case MEDIA_TAXI_140:
traffic.forward.PCR_all_traffic = ATM_PCR_TAXI140;
traffic.backward.PCR_all_traffic = ATM_PCR_TAXI140;
break;
case MEDIA_OC3C:
case MEDIA_UTP155:
traffic.forward.PCR_all_traffic = ATM_PCR_OC3C;
traffic.backward.PCR_all_traffic = ATM_PCR_OC3C;
break;
case MEDIA_OC12C:
traffic.forward.PCR_all_traffic = ATM_PCR_OC12C;
traffic.backward.PCR_all_traffic = ATM_PCR_OC12C;
break;
case MEDIA_UNKNOWN:
break;
}
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_TRAFFIC,
(caddr_t)&traffic, sizeof(traffic)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Set bearer capability options
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_BEARER_CAP,
(caddr_t)&bearer, sizeof(bearer)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Set QOS options
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_QOS,
(caddr_t)&qos, sizeof(qos)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Set LLC identifier
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_LLC,
(caddr_t)&llc_scsp, sizeof(llc_scsp)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Set application name
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_APP_NAME,
(caddr_t)&appname, sizeof(appname)) < 0) {
rc = EOPNOTSUPP;
goto connect_fail;
}
/*
* Connect to DCS
*/
if (connect(sd, (struct sockaddr *)&DCS_addr,
sizeof(DCS_addr)) < 0 &&
errno != EINPROGRESS) {
rc = errno;
goto connect_fail;
}
/*
* Set return values
*/
dcsp->sd_sock = sd;
return(0);
connect_fail:
/*
* Close the socket if something didn't work
*/
(void)close(sd);
dcsp->sd_sock = -1;
if (rc == 0)
rc = EFAULT;
return(rc);
}
/*
* Listen for ATM connections from DCSs
*
* Arguments:
* None
*
* Returns:
* sock socket which is listening (also set in
ssp->ss_dcs_lsock)
* -1 error encountered (reason in errno)
*
*/
int
scsp_dcs_listen(ssp)
Scsp_server *ssp;
{
int rc, sd;
struct sockaddr_atm ls_addr;
/*
* Open a socket
*/
sd = socket(PF_ATM, SOCK_SEQPACKET, ATM_PROTO_AAL5);
if (sd == -1) {
rc = errno;
goto listen_fail;
}
if (sd > scsp_max_socket) {
scsp_max_socket = sd;
}
/*
* Set up our address
*/
bzero(&ls_addr, sizeof(ls_addr));
#if (defined(BSD) && (BSD >= 199103))
ls_addr.satm_len = sizeof(ls_addr);
#endif
ls_addr.satm_family = AF_ATM;
ls_addr.satm_addr.t_atm_sap_addr.SVE_tag_addr = T_ATM_PRESENT;
ls_addr.satm_addr.t_atm_sap_addr.SVE_tag_selector =
T_ATM_PRESENT;
ls_addr.satm_addr.t_atm_sap_addr.address_format =
ssp->ss_addr.address_format;
ls_addr.satm_addr.t_atm_sap_addr.address_length =
ssp->ss_addr.address_length;
bcopy(ssp->ss_addr.address,
ls_addr.satm_addr.t_atm_sap_addr.address,
ssp->ss_addr.address_length);
ls_addr.satm_addr.t_atm_sap_layer2.SVE_tag = T_ATM_PRESENT;
ls_addr.satm_addr.t_atm_sap_layer2.ID_type = T_ATM_SIMPLE_ID;
ls_addr.satm_addr.t_atm_sap_layer2.ID.simple_ID =
T_ATM_BLLI2_I8802;
ls_addr.satm_addr.t_atm_sap_layer3.SVE_tag = T_ATM_ABSENT;
ls_addr.satm_addr.t_atm_sap_appl.SVE_tag = T_ATM_ABSENT;
/*
* Bind the socket to our address
*/
rc = bind(sd, (struct sockaddr *)&ls_addr, sizeof(ls_addr));
if (rc == -1) {
rc = errno;
goto listen_fail;
}
/*
* Set non-blocking I/O
*/
#ifdef sun
rc = fcntl(sd, F_SETFL, FNBIO + FNDELAY);
#else
rc = fcntl(sd, F_SETFL, O_NONBLOCK);
#endif
if (rc == -1) {
scsp_log(LOG_ERR, "scsp_dcs_listen: fcntl failed");
rc = errno;
goto listen_fail;
}
/*
* Set AAL 5 options
*/
aal5.forward_max_SDU_size = ssp->ss_mtu;
aal5.backward_max_SDU_size = ssp->ss_mtu;
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_AAL5, (caddr_t)&aal5,
sizeof(aal5)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Set traffic options
*/
switch(ssp->ss_media) {
case MEDIA_TAXI_100:
traffic.forward.PCR_all_traffic = ATM_PCR_TAXI100;
traffic.backward.PCR_all_traffic = ATM_PCR_TAXI100;
break;
case MEDIA_TAXI_140:
traffic.forward.PCR_all_traffic = ATM_PCR_TAXI140;
traffic.backward.PCR_all_traffic = ATM_PCR_TAXI140;
break;
case MEDIA_OC3C:
case MEDIA_UTP155:
traffic.forward.PCR_all_traffic = ATM_PCR_OC3C;
traffic.backward.PCR_all_traffic = ATM_PCR_OC3C;
break;
case MEDIA_OC12C:
traffic.forward.PCR_all_traffic = ATM_PCR_OC12C;
traffic.backward.PCR_all_traffic = ATM_PCR_OC12C;
break;
case MEDIA_UNKNOWN:
break;
}
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_TRAFFIC,
(caddr_t)&traffic, sizeof(traffic)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Set bearer capability options
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_BEARER_CAP,
(caddr_t)&bearer, sizeof(bearer)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Set QOS options
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_QOS,
(caddr_t)&qos, sizeof(qos)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Set LLC identifier
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_LLC,
(caddr_t)&llc_scsp, sizeof(llc_scsp)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Set application name
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_APP_NAME,
(caddr_t)&appname, sizeof(appname)) < 0) {
rc = EOPNOTSUPP;
goto listen_fail;
}
/*
* Listen for new connections
*/
if (listen(sd, 5) < 0) {
rc = errno;
goto listen_fail;
}
ssp->ss_dcs_lsock = sd;
return(sd);
listen_fail:
/*
* Close the socket if anything didn't work
*/
(void)close(sd);
if (rc == 0)
errno = EFAULT;
else
errno = rc;
ssp->ss_dcs_lsock = -1;
return(-1);
}
/*
* Accept a connection from a DCS
*
* Arguments:
* ssp pointer to server block
*
* Returns:
* address of DCS with new connection
* 0 failure (errno has reason)
*
*/
Scsp_dcs *
scsp_dcs_accept(ssp)
Scsp_server *ssp;
{
int len, rc, sd;
struct sockaddr_atm dcs_sockaddr;
struct t_atm_sap_addr *dcs_addr = &dcs_sockaddr.satm_addr.t_atm_sap_addr;
Atm_addr dcs_atmaddr;
Scsp_dcs *dcsp;
/*
* Accept the new connection
*/
len = sizeof(dcs_sockaddr);
sd = accept(ssp->ss_dcs_lsock,
(struct sockaddr *)&dcs_sockaddr, &len);
if (sd < 0) {
return((Scsp_dcs *)0);
}
if (sd > scsp_max_socket) {
scsp_max_socket = sd;
}
/*
* Copy the DCS's address from the sockaddr to an Atm_addr
*/
if (dcs_addr->SVE_tag_addr != T_ATM_PRESENT) {
dcs_atmaddr.address_format = T_ATM_ABSENT;
dcs_atmaddr.address_length = 0;
} else {
dcs_atmaddr.address_format = dcs_addr->address_format;
dcs_atmaddr.address_length = dcs_addr->address_length;
bcopy(dcs_addr->address, dcs_atmaddr.address,
dcs_addr->address_length);
}
/*
* Find out which DCS this connection is for
*/
for (dcsp = ssp->ss_dcs; dcsp; dcsp = dcsp->sd_next) {
/*
* Compare DCS's address to address
* configured by user
*/
if (ATM_ADDR_EQUAL(&dcsp->sd_addr,
&dcs_atmaddr))
break;
}
/*
* Make sure we have this DCS configured
*/
if (!dcsp) {
errno = EINVAL;
goto dcs_accept_fail;
}
/*
* Make sure we are in a state to accept the connection
*/
if (ssp->ss_state != SCSP_SS_ACTIVE) {
errno = EACCES;
goto dcs_accept_fail;
}
/*
* Make sure we don't already have a connection to this DCS
*/
if (dcsp->sd_sock != -1) {
errno = EALREADY;
goto dcs_accept_fail;
}
/*
* Set application name
*/
if (setsockopt(sd, T_ATM_SIGNALING, T_ATM_APP_NAME,
(caddr_t)&appname, sizeof(appname)) < 0) {
rc = EOPNOTSUPP;
goto dcs_accept_fail;
}
/*
* Set non-blocking I/O
*/
#ifdef sun
rc = fcntl(sd, F_SETFL, FNBIO + FNDELAY);
#else
rc = fcntl(sd, F_SETFL, O_NONBLOCK);
#endif
if (rc == -1) {
goto dcs_accept_fail;
}
/*
* Cancel the open retry timer
*/
HARP_CANCEL(&dcsp->sd_open_t);
/*
* Save the socket address and return the
* address of the DCS
*/
dcsp->sd_sock = sd;
return(dcsp);
dcs_accept_fail:
/*
* An error has occured--clean up and return
*/
(void)close(sd);
return((Scsp_dcs *)0);
}
/*
* Read an SCSP message from a directly connected server
*
* Arguments:
* dcsp pointer to DCS block that has data
*
* Returns:
* 0 success
* else errno indicating reason for failure
*
*/
int
scsp_dcs_read(dcsp)
Scsp_dcs *dcsp;
{
int len, rc;
char *buff = (char *)0;
Scsp_server *ssp = dcsp->sd_server;
Scsp_msg *msg;
/*
* Get a buffer to hold the entire message
*/
len = ssp->ss_mtu;
buff = calloc(1, len);
if (buff == NULL)
scsp_mem_err("scsp_dcs_read: ssp->ss_mtu");
/*
* Read the message
*/
len = read(dcsp->sd_sock, buff, len);
if (len < 0) {
goto dcs_read_fail;
}
/*
* Parse the input message and pass it to the Hello FSM
*/
msg = scsp_parse_msg(buff, len);
if (msg) {
/*
* Write the message to the trace file if
* it's of a type we're tracing
*/
if (((scsp_trace_mode & SCSP_TRACE_HELLO_MSG) &&
msg->sc_msg_type == SCSP_HELLO_MSG) ||
((scsp_trace_mode & SCSP_TRACE_CA_MSG) &&
msg->sc_msg_type != SCSP_HELLO_MSG)) {
scsp_trace_msg(dcsp, msg, 1);
scsp_trace("\n");
}
/*
* Pass the message to the Hello FSM
*/
rc = scsp_hfsm(dcsp, SCSP_HFSM_RCVD, msg);
scsp_free_msg(msg);
} else {
/*
* Message was invalid. Write it to the trace file
* if we're tracing messages.
*/
if (scsp_trace_mode & (SCSP_TRACE_HELLO_MSG &
SCSP_TRACE_CA_MSG)) {
int i;
scsp_trace("Invalid message received:\n");
scsp_trace("0x");
for (i = 0; i < len; i++) {
scsp_trace("%02x ", (u_char)buff[i]);
}
scsp_trace("\n");
}
}
free(buff);
return(0);
dcs_read_fail:
/*
* Error on read--check for special conditions
*/
rc = errno;
if (errno == ECONNRESET) {
/*
* VCC has been closed--pass the event to
* the Hello FSM
*/
rc = scsp_hfsm(dcsp, SCSP_HFSM_VC_CLOSED,
(Scsp_msg *)0);
}
if (errno == ECONNREFUSED) {
/*
* VCC open failed--set a timer and try
* again when it fires
*/
HARP_TIMER(&dcsp->sd_open_t,
SCSP_Open_Interval,
scsp_open_timeout);
rc = 0;
}
if (buff)
free(buff);
return(rc);
}
/*
* Listen for Unix connections from SCSP client servers
*
* Arguments:
* None
*
* Returns:
* sock socket which is listening
* -1 error (reason in errno)
*
*/
int
scsp_server_listen()
{
int rc, sd;
static struct sockaddr scsp_addr = {
#if (defined(BSD) && (BSD >= 199103))
sizeof(struct sockaddr), /* sa_len */
#endif
AF_UNIX, /* sa_family */
SCSPD_SOCK_NAME /* sa_data */
};
/*
* Unlink any old socket
*/
rc = unlink(SCSPD_SOCK_NAME);
if (rc < 0 && errno != ENOENT)
return(-1);
/*
* Open a socket
*/
sd = socket(PF_UNIX, SOCK_STREAM, 0);
if (sd == -1) {
return(-1);
}
if (sd > scsp_max_socket) {
scsp_max_socket = sd;
}
/*
* Bind the socket's address
*/
rc = bind(sd, &scsp_addr, sizeof(scsp_addr));
if (rc == -1) {
(void)close(sd);
return(-1);
}
/*
* Set non-blocking I/O
*/
#ifdef sun
rc = fcntl(sd, F_SETFL, FNBIO + FNDELAY);
#else
rc = fcntl(sd, F_SETFL, O_NONBLOCK);
#endif
if (rc == -1) {
(void)close(sd);
return(-1);
}
/*
* Listen for new connections
*/
if (listen(sd, 5) < 0) {
(void)close(sd);
return(-1);
}
return(sd);
}
/*
* Accept a connection from a server
*
* We accept a connection, but we won't know which server it is
* from until we get the configuration data from the server. We
* put the connection on a 'pending' queue and will assign it to
* a server when the config data arrives.
*
* Arguments:
* ls listening socket to accept from
*
* Returns:
* 0 success
* errno reason for failure
*
*/
int
scsp_server_accept(ls)
int ls;
{
int len, rc, sd;
struct sockaddr server_addr;
Scsp_pending *psp;
/*
* Accept the new connection
*/
len = sizeof(server_addr);
sd = accept(ls, (struct sockaddr *)&server_addr, &len);
if (sd < 0) {
return(errno);
}
if (sd > scsp_max_socket) {
scsp_max_socket = sd;
}
/*
* Set non-blocking operation
*/
#ifdef sun
rc = fcntl(sd, F_SETFL, FNBIO + FNDELAY);
#else
rc = fcntl(sd, F_SETFL, O_NONBLOCK);
#endif
if (rc == -1) {
(void)close(sd);
rc = errno;
}
/*
* Put the new socket on the 'pending' queue
*/
psp = calloc(1, sizeof(Scsp_pending));
if (!psp)
scsp_mem_err("scsp_server_accept: sizeof(Scsp_pending)");
psp->sp_sock = sd;
LINK2TAIL(psp, Scsp_pending, scsp_pending_head, sp_next);
return(0);
}
/*
* Read a server interface message from a socket
*
* Arguments:
* sd socket to read from
*
* Returns:
* msg pointer to message read
* 0 failure (errno has reason)
*
*/
Scsp_if_msg *
scsp_if_sock_read(sd)
int sd;
{
int len;
char *buff = (char *)0;
Scsp_if_msg *msg;
Scsp_if_msg_hdr msg_hdr;
/*
* Read the message header from the socket
*/
len = read(sd, (char *)&msg_hdr, sizeof(msg_hdr));
if (len != sizeof(msg_hdr)) {
if (len >= 0)
errno = EINVAL;
goto socket_read_fail;
}
/*
* Get a buffer and read the rest of the message into it
*/
buff = malloc(msg_hdr.sh_len);
if (buff == NULL)
scsp_mem_err("scsp_if_sock_read: msg_hdr.sh_len");
msg = (Scsp_if_msg *)buff;
msg->si_hdr = msg_hdr;
len = read(sd, &buff[sizeof(Scsp_if_msg_hdr)],
msg->si_len - sizeof(Scsp_if_msg_hdr));
if (len != msg->si_len - sizeof(Scsp_if_msg_hdr)) {
if (len >= 0) {
errno = EINVAL;
}
goto socket_read_fail;
}
/*
* Trace the message
*/
if (scsp_trace_mode & SCSP_TRACE_IF_MSG) {
scsp_trace("Received server I/F message:\n");
print_scsp_if_msg(scsp_trace_file, msg);
scsp_trace("\n");
}
return(msg);
socket_read_fail:
if (buff)
free(buff);
return((Scsp_if_msg *)0);
}
/*
* Write a server interface message to a socket
*
* Arguments:
* sd socket to write to
* msg pointer to message to write
*
* Returns:
* 0 success
* errno reason for failure
*
*/
int
scsp_if_sock_write(sd, msg)
int sd;
Scsp_if_msg *msg;
{
int len, rc;
/*
* Trace the message
*/
if (scsp_trace_mode & SCSP_TRACE_IF_MSG) {
scsp_trace("Writing server I/F message:\n");
print_scsp_if_msg(scsp_trace_file, msg);
scsp_trace("\n");
}
/*
* Write the message to the indicated socket
*/
len = write(sd, (char *)msg, msg->si_len);
if (len != msg->si_len) {
if (len < 0)
rc = errno;
else
rc = EINVAL;
} else {
rc = 0;
}
return(rc);
}
/*
* Read data from a local server
*
* Arguments:
* ssp pointer to server block that has data
*
* Returns:
* 0 success
* else errno indicating reason for failure
*
*/
int
scsp_server_read(ssp)
Scsp_server *ssp;
{
int rc;
Scsp_dcs *dcsp;
Scsp_if_msg *msg;
/*
* Read the message
*/
msg = scsp_if_sock_read(ssp->ss_sock);
if (!msg) {
if (errno == EWOULDBLOCK) {
/*
* Nothing to read--just return
*/
return(0);
} else {
/*
* Error--shut down the server entry
*/
scsp_server_shutdown(ssp);
}
return(errno);
}
/*
* Process the received message
*/
switch(msg->si_type) {
case SCSP_NOP_REQ:
/*
* Ignore a NOP
*/
break;
case SCSP_CACHE_RSP:
/*
* Summarize the server's cache and try to open
* connections to all of its DCSs
*/
scsp_process_cache_rsp(ssp, msg);
ssp->ss_state = SCSP_SS_ACTIVE;
for (dcsp = ssp->ss_dcs; dcsp; dcsp = dcsp->sd_next) {
if (scsp_dcs_connect(dcsp)) {
/*
* Connect failed -- the DCS may not
* be up yet, so we'll try again later
*/
HARP_TIMER(&dcsp->sd_open_t,
SCSP_Open_Interval,
scsp_open_timeout);
}
}
ssp->ss_state = SCSP_SS_ACTIVE;
break;
case SCSP_SOLICIT_RSP:
/*
* The server has answered our request for a particular
* entry from its cache
*/
dcsp = (Scsp_dcs *)msg->si_tok;
rc = scsp_cfsm(dcsp, SCSP_CIFSM_SOL_RSP, (Scsp_msg *)0,
msg);
break;
case SCSP_UPDATE_REQ:
/*
* Pass the update request to the FSMs for all
* DCSs associated with the server
*/
if (ssp->ss_state == SCSP_SS_ACTIVE) {
for (dcsp = ssp->ss_dcs; dcsp;
dcsp = dcsp->sd_next) {
rc = scsp_cfsm(dcsp, SCSP_CIFSM_UPD_REQ,
(Scsp_msg *)0, msg);
}
}
break;
case SCSP_UPDATE_RSP:
/*
* Pass the update response to the FSM for the
* DCS associated with the request
*/
dcsp = (Scsp_dcs *)msg->si_tok;
rc = scsp_cfsm(dcsp, SCSP_CIFSM_UPD_RSP,
(Scsp_msg *)0, msg);
break;
default:
scsp_log(LOG_ERR, "invalid message type %d from server",
msg->si_type);
return(EINVAL);
}
free(msg);
return(0);
}
/*
* Send a Cache Indication to a server
*
* Arguments:
* ssp pointer to server block block
*
* Returns:
* 0 success
* else errno indicating reason for failure
*
*/
int
scsp_send_cache_ind(ssp)
Scsp_server *ssp;
{
int rc;
Scsp_if_msg *msg;
/*
* Get storage for a server interface message
*/
msg = calloc(1, sizeof(Scsp_if_msg));
if (msg == NULL)
scsp_mem_err("scsp_send_cache_ind: sizeof(Scsp_if_msg)");
/*
* Fill out the message
*/
msg->si_type = SCSP_CACHE_IND;
msg->si_proto = ssp->ss_pid;
msg->si_len = sizeof(Scsp_if_msg_hdr);
msg->si_tok = (u_long)ssp;
/*
* Send the message
*/
rc = scsp_if_sock_write(ssp->ss_sock, msg);
free(msg);
return(rc);
}
/*
* Read data from a pending server connection
*
* Arguments:
* psp pointer to pending block that has data
*
* Returns:
* 0 success
* else errno indicating reason for failure
*
*/
int
scsp_pending_read(psp)
Scsp_pending *psp;
{
int rc;
Scsp_server *ssp;
Scsp_if_msg *msg;
/*
* Read the message from the pending socket
*/
msg = scsp_if_sock_read(psp->sp_sock);
if (!msg) {
rc = errno;
goto pending_read_fail;
}
/*
* Make sure this is configuration data
*/
if (msg->si_type != SCSP_CFG_REQ) {
scsp_log(LOG_ERR, "invalid message type %d from pending server",
msg->si_type);
rc = EINVAL;
goto pending_read_fail;
}
/*
* Find the server this message is for
*/
for (ssp = scsp_server_head; ssp; ssp = ssp->ss_next) {
if (strcmp(ssp->ss_intf, msg->si_cfg.atmarp_netif) == 0)
break;
}
if (!ssp) {
scsp_log(LOG_ERR, "refused connection from server for %s",
msg->si_cfg.atmarp_netif);
rc = EINVAL;
goto config_reject;
}
/*
* Make sure the server is ready to go
*/
rc = scsp_get_server_info(ssp);
if (rc) {
goto config_reject;
}
/*
* Save the socket
*/
ssp->ss_sock = psp->sp_sock;
ssp->ss_state = SCSP_SS_CFG;
UNLINK(psp, Scsp_pending, scsp_pending_head, sp_next);
free(psp);
/*
* Listen for connections from the server's DCSs
*/
rc = scsp_dcs_listen(ssp);
if (rc < 0) {
rc = errno;
goto config_reject;
}
/*
* Respond to the configuration message
*/
msg->si_type = SCSP_CFG_RSP;
msg->si_rc = SCSP_RSP_OK;
msg->si_len = sizeof(Scsp_if_msg_hdr);
rc = scsp_if_sock_write(ssp->ss_sock, msg);
if (rc) {
goto config_error;;
}
/*
* Ask the server to send us its cache
*/
rc = scsp_send_cache_ind(ssp);
if (rc) {
goto config_error;
}
free(msg);
return(0);
config_reject:
/*
* Respond to the configuration message
*/
msg->si_type = SCSP_CFG_RSP;
msg->si_rc = SCSP_RSP_REJ;
msg->si_len = sizeof(Scsp_if_msg_hdr);
(void)scsp_if_sock_write(ssp->ss_sock, msg);
config_error:
if (ssp->ss_sock != -1) {
(void)close(ssp->ss_sock);
ssp->ss_sock = -1;
}
if (ssp->ss_dcs_lsock != -1) {
(void)close(ssp->ss_dcs_lsock);
ssp->ss_sock = -1;
}
ssp->ss_state = SCSP_SS_NULL;
free(msg);
return(rc);
pending_read_fail:
/*
* Close the socket and free the pending read block
*/
(void)close(psp->sp_sock);
UNLINK(psp, Scsp_pending, scsp_pending_head, sp_next);
free(psp);
if (msg)
free(msg);
return(rc);
}